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A Lincolnshire mum was left shocked when two of her children brought home a number of empty laughing gas canisters they had found at a park.

Sarah Richards, 44, saw her two teenage sons come home from playing at the local park in Billinghay with the metal containers which contain the potentially deadly nitrous oxide and are often misused by drug-users.

The substance is used in hospitals to treat people, particularly for women going through child birth, but if overused it can be potentially dangerous because it cuts off the oxygen from the system.